
How Long Does Flea Treatment Take to Work? Timing Guide
Still seeing fleas an hour after treating? That’s normal. Vet-reviewed guide to how long flea treatments take to work and when it’s safe to reapply.
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FRONTPRO is a chewable tablet that treats flea and tick infestations on your dog. It kills fleas within 8 hours, before they can lay eggs, which helps prevent fleas spreading in your home. Ticks are killed within 48 hours. You can give it with or without food.
iIf your dog is unwell, check with your vet before treating.
This item requires a current prescription from your vet before we can dispatch it. The good news? Sorting it out is simple and only takes a moment.
As soon as your prescription reaches us, our team will verify the details and get your pet’s treatment posted out to you.
FRONTPRO is a chewable tablet that treats flea and tick infestations on your dog. It kills fleas within 8 hours, before they can lay eggs, which helps prevent fleas spreading in your home. Ticks are killed within 48 hours. You can give it with or without food.
iIf your dog is unwell, check with your vet before treating.
FRONTPRO chewable tablets for dogs, from the makers of FRONTLINE, are a non-prescription (NFA-VPS) monthly flea and tick treatment in a beef-flavoured chew. Each tablet contains afoxolaner. One dose kills fleas for 5 weeks and ticks for one month.
FRONTPRO kills fleas within 8 hours, before they can lay eggs, which stops flea eggs building up in your home. Ticks are killed within 48 hours.
FRONTPRO flea and tick tablets are suitable for puppies from 8 weeks old weighing at least 2kg, and for breeding, pregnant and lactating female dogs. Speak to your vet before treating breeding males, or a puppy that is younger or lighter.
Want to know more about timing? Read how long flea treatment takes to work or how to check your dog for fleas.
Weigh your dog before treating.
Too low a dose may not work and can help resistance build up.
Size guide
UK legal category: NFA‑VPS (Non-Food Animal – Veterinarian, Pharmacist, Suitably Qualified Person).
Give one FRONTPRO tablet matched to your dog’s weight once a month through flea and tick season. It can be given with or without food, and most dogs take it like a treat. Tablets should not be divided.
Dogs over 50kg need a combination of tablets. Follow the label, or ask your vet if you’re unsure.
For full safety information, read the FRONTPRO datasheet (NOAH) or the VMD datasheet for your strength: 11mg, 28mg, 68mg, 136mg.
Choosing the right FRONTPRO flea tablets for dogs
Four strengths, matched to your dog’s bodyweight. Every strength comes in a 1-tablet or 3-tablet pack.
Weigh your dog before choosing a strength.
Dogs over 50kg take a combination of tablets, as the label directs.
Why choose FRONTPRO Chewable Tablets Flea & Tick Treatment for Dogs?
FRONTPRO Active substance:
Select the treatment you would like to order
Provide all the information about your pet
Your order will be sent in discreet packaging.
Yes. POM-V items require a valid prescription from your UK vet.
Upload your prescription during checkout.
Photos must be clear. If details are wrong or expired, orders can’t be processed. This is standard across UK pet pharmacies.
No. Under UK law, vets must provide a written prescription if you request one for a POM-V medicine. They may charge a reasonable fee for issuing it, but they cannot refuse. This allows you to choose where to buy your pet’s medication, whether directly from your vet or from a registered UK pharmacy such as Ashcroft 4 Pets.
In the UK, most POM-V prescriptions are valid for 6 months, unless your vet specifies a shorter duration. Prescriptions for Schedule 2 or 3 controlled medicines are usually valid for 28 days and are not repeatable. At Ashcroft 4 Pets, we follow these same UK veterinary guidelines to ensure your pet’s medication is dispensed safely and legally.
At Ashcroft 4 Pets, we are a fully VMD-registered and accredited online retailer. This means every prescription and over-the-counter pet medicine we supply is safe, genuine, and dispensed according to UK law.
We follow all Veterinary Medicines Directorate (VMD) rules, and our team checks every prescription carefully before processing. You can order with confidence, knowing your pet’s health is in the hands of experts and all medicines are traceable, legally supplied, and authentic.
In the UK, most repeat prescriptions for POM-V medicines are valid for up to 6 months from the date your vet issues them. You can order multiple times within this period if your vet has authorised repeats.
For controlled medicines (Schedule 2 or 3), the prescription is valid for 28 days only and cannot be repeated. These medicines are strictly regulated due to their potential for misuse.
At Ashcroft 4 Pets, we follow UK law carefully, ensuring all prescriptions are dispensed safely, legally, and in the exact amounts prescribed.
If your vet prescribes a human medicine for your pet under the Cascade, we can usually dispense against that prescription (with the right checks).

Still seeing fleas an hour after treating? That’s normal. Vet-reviewed guide to how long flea treatments take to work and when it’s safe to reapply.

Digestive problems in dogs are common and can be stressful for owners to manage. Because dogs are natural scavengers, their stomachs are often exposed to foods and substances that may upset digestion.

Yes, dogs can get fleas in winter. Many owners have seen infestations during the winter months that were even worse than in summer.